Abstract
Across the cropping region of southern New South Wales the majority of paddocks contain populations of grass weeds resistant to herbicides.
With broadleaf weeds also treated with herbicides in many of these paddocks and the high levels of resistance found in Western Australian wild radish populations, two field surveys of crops in southern
New South Wales in 2011 and 2012 collected samples of wild radish, Indian hedge mustard and sow thistle. In 2011, 35 paddocks were visited, resulting in 11 wild radish samples being collected while 143 paddocks were visited in 2012 from which 19 wild radish, 20 Indian hedge mustard and 79 sow thistle samples were collected. The samples were screened between June and August the year after collection to a number of different herbicides. In both surveys samples were only
found to be resistant to Group B herbicides with one wild radish sample from the 2011 survey resistant to chlosulfuron and imazamox + imazapyr and another developing resistance to imazamox + imazapyr. From the 2012 survey samples 35% of the sow thistle samples (28/79) were resistant to metsulfuron-methyl and 15% of wild radish samples (3/19) were resistant to chlorsulfuron, while no Indian hedge mustard samples were resistant to chlorsulfuron. Other herbicides screened to which no resistance was found included atrazine, terbuthylazine, diflufenican, 2,4-D amine or glyphosate. The absence of resistance to any herbicides other than the Group B herbicides is good news for
farmers in southern New South Wales as they still have several options for controlling these broadleaf weeds.
With broadleaf weeds also treated with herbicides in many of these paddocks and the high levels of resistance found in Western Australian wild radish populations, two field surveys of crops in southern
New South Wales in 2011 and 2012 collected samples of wild radish, Indian hedge mustard and sow thistle. In 2011, 35 paddocks were visited, resulting in 11 wild radish samples being collected while 143 paddocks were visited in 2012 from which 19 wild radish, 20 Indian hedge mustard and 79 sow thistle samples were collected. The samples were screened between June and August the year after collection to a number of different herbicides. In both surveys samples were only
found to be resistant to Group B herbicides with one wild radish sample from the 2011 survey resistant to chlosulfuron and imazamox + imazapyr and another developing resistance to imazamox + imazapyr. From the 2012 survey samples 35% of the sow thistle samples (28/79) were resistant to metsulfuron-methyl and 15% of wild radish samples (3/19) were resistant to chlorsulfuron, while no Indian hedge mustard samples were resistant to chlorsulfuron. Other herbicides screened to which no resistance was found included atrazine, terbuthylazine, diflufenican, 2,4-D amine or glyphosate. The absence of resistance to any herbicides other than the Group B herbicides is good news for
farmers in southern New South Wales as they still have several options for controlling these broadleaf weeds.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 19th Australasian Weed Conference (2014) |
| Subtitle of host publication | Science, Community and Food Security: the Weed Challenge |
| Editors | Matthew Baker |
| Place of Publication | Hobart |
| Publisher | Tasmanian Weed Society Inc |
| Pages | 282-285 |
| Number of pages | 4 |
| ISBN (Electronic) | 9780646924540 |
| Publication status | Published - 2014 |
| Event | 19th Australasian Weeds Conference (2014) - Hotel Grand Chancellor, Hobart, Australia Duration: 01 Sept 2014 → 04 Sept 2014 https://caws.org.nz/old-site/awc_contents.php?yr=2014 |
Conference
| Conference | 19th Australasian Weeds Conference (2014) |
|---|---|
| Abbreviated title | Science, Community and Food Security: the Weed Challenge |
| Country/Territory | Australia |
| City | Hobart |
| Period | 01/09/14 → 04/09/14 |
| Internet address |